Midterm I: Plexuses (Ben)

Question 1

From which plexus does iliohypogastric nerve originate?

What does it innervate?

Answer 1

from lumbar plexus (T12-L1)

inn. abdominal skin + internal oblique / transverse abdominal

Question 2

What are the important nerves coming from the cervical plexus relevant to the dorsal regions?

What do they innervate?

Answer 2

Supraclavicular Nerves (C3/4) - innervate infraclavicular region, (medial, intermediate and later)

Phrenic Nerve (C3-5) - diaphragm

Scalenus Nerves (C3-6)

Question 3

What nerve innervates (most of) the adductors?

From which plexus?

Which adductor does it not innervate?

Answer 3

Obturator N.

Lumbar plexus (L2-4)

• all except pectineus

Question 4

What innervates the pectoralis muscles?

From which plexus?

Answer 4

Medial and Lateral Pectoral Nerves

• from brachial plexus (med/lat cords)

Question 5

What innervates the quadriceps and other anterior femoral region muscles?

Which other muscles?

It also gives cutaneous branches. What are they?

And where does it originate?

Answer 5

Femoral Nerve (from lumbar plexus, L2/L3)

• also innervates sartorius and pectineus
• gives anterior femoral cutaneous + saphenous nerve

Question 6

What innervates the skin of the femoral triangle?

Answer 6

Femoral Branch, genitofemoral nerve

Question 7

Which spinal nerves contribute to the brachial plexus?

Answer 7

C5 - T1

Question 8

Which spinal nerves contribute to the lumbar plexus?

Answer 8

T12 - L4

Question 9

Which spinal nerves contribute to the cervical plexus?

Answer 9

C1 - C5